Power operated control for draft regulators



Sept. 19, 1933. c. H. MORROW POWER OPERATED CONTROL FOR DRAFT REGULATORS Filed April 6. 1935 I N VE N TOR A TTOR%EY5 Patented Sept. '19, 1933 This invention relates to power closing means for automatic draft control dampers. In'such' a draft regulator the shutter has associated weights whereby its Opening and closing draft controlling adjustment is automatic, and has carefully predetermined characteristics; and such automatic action is the usual one of the damper. 'I-Io'wever, under certain temporary -con'ditions,'such as duringa firing period, it is necessary that the shutter be closed.

The objects of this invention are to provide" power means for closing of the damper by the operator from a convenient location which'may be removed from the damper.

Theshutter is mounted fupon a sloping axis,

at the ,endof an air inlet pipe; and various installation conditions require that the device be mountable with the axis sloping in either of the two possible directions. A further object of the invention is to provide that the described closing adjustment may be had regardless of the direction of slope and without any alteration to the device itself other than its more installation.

Further objects are to accomplish the dei 7 in the art and will-be found further disclosed in -my copending 1 application, Serial N0; 653,393,"?

scribed results by simple inexpensive andreliable means, in compact arrangement.

The' exact na'ture' fthis invention together' with further objects and advantages thereof will be apparent from the following description an embodiment of the inventionin a typical automatic damper installation; the parts being shown as in open position, topermit automatic damper operation; Figs. 2 and 3 are enlarged details of the means providing operator control f of the dampery'Fig. 2 being a front elevation with p'arts broken away to-show details of construcdiagramillustrating the connections for control of the motor. I

With reference now to the drawing, the'princi- 1 peripheral flange 2a and nondiametric'al'rib 4,

is 'mounted for free swinging movementabout taken in connection with the accompanyin drawing, in which'Figyl is an assembly view of tion and'FigQ 3 being a section as inthe planeof line 3-3, Fig: 2; Fig. 4is' an-elementary wiring and ashutter 2 adapted to close the openingend of the pipe through which flow is to be con- 1 which may preferably be of sheet metal as indicated, reinforced as bythef an axis in the plane of the base, in one direction 9 from said plane. The axis' "of swing; as Jindicated by the line A'A, is nondiametricaland preferably adjacentthe rib "4, and further de Y tails of the exact arrangement by which'the. shutter is mounted are immaterial here.

The shutter thus has a long'side'B and'a short" I side C extending from the axis. That: the long] side B may swing inwardly only, from the plane of the base-.1, while the short side' C may swing" outwardly only therefrom, the 'base'isprovided 5 with a-flange 51Overlying the sid'ei-Band afiange 6 underlying the side C; The shutter is preferably weighted by means notshown and forming no f part of this invention, togive it predetermined opening and closing characteristics"providedthe-S",

axis A-A have the proper slope; and thatthis I slope may be accurately attained when mounting V I the device,;the front face of the base ljis 'pro vided withjindexing indicia asindicated Fig. '1 There are two sets of such indici'a, providing for plumbing of the base-ineitherof two positions depending on the direction of draft; whereinthe axis A-A has'slope-in opposite directions.

What has thus (far been'described is not new- 5 filed-September 24, l933', and'it will be appre-, ciated that when-properlyjmounted in either of the two positions and under the'usu'al conditions, the shutter-will fioatin partly opened positio'ns auomatically adiusting'dtself to provide 'the' proper flow through the pipe to the-end'of' which itiS attached."

According toflthis invention I provide means; 1 for closing the shutter when desired; The principal parts of thedev'ice -of the invention area crank member 7, a flexible connector 8 arranged to -be effective between thefree endv of'thecrank '7 and the long side B of the shutter,-guide means for thecon'nector 8, a motor '9, means for driv- I ing the crank'by the motor, and control connectionsfor the motor.

The connector} maybe simply a chain, of the type indicated wherein eachlink' has swivel connection with the adjacent links." It isse cured with the shutteras at'lO, preferably 'a;p

proximately centrally of-thearea of the long shutter 'side B. The oppositegend cfithe con nector is joined to the crank by a swivel mount 5 ed'fitting'm; a T

,The guide means comprises a bracket 11 mounted upon'theba'se' 1 as by screws 12, extending inwardly of the'base and. carrying" an 'endpulley 13 and a pair of pulleys 14, with acover plate 15 overlyingthe "pulleys, themtween the pulleysl l to the end'of the crank 7' when the latterris in the position shown in the drawings. h

"The, crank shaft 16 bears inthe: bracket 1. adjacent the base 1 as indicated'sothat'the path of the crank partly overlies the shutter 1 but extends outwardly beyond the base 1, in

'planespaced from that of the base, the. bracket "11 being disposed betweenjhese planes.

The parts are so proportioned and, arranged particularly as to the lengths 'of themconnectoi" Sand the crank 7, that when the crankisin the tional operation as has the crankfl, which diposition illustrated, the shutter will be free to swing in automatic operation as far asisneces- V a '.While the crank moves from'open to closed sary, whereas if the crank be moved toaposi tionlSO" removed from that illustrated, it will Q actuate the connector 8 to close the shutter. The bracket 11' has a part 17 extending be jyond the base Land the motor 9 is secured-to this bracket part I 17 as by screws 18,, and the 7 motor is thus positioned; alongside the pipe 1 on 53 which thebase may be mounted underlying the v outer part of thecrank throw. similarly as the pipe underlies the inner part of the; crank 'throw.; a Driving connections carried by thebracketare provided from the motor .to the crank. As here shown theseconnections'include a; pair of helical gears lQQ'connecting the motor shaft with an intermediate shaft- 20carryi-ng a worm2l, which worm meshes with a wheel 22 secured on the .69 crankshaft 16. The bracket casting andpar ticularly its part 17: is -formed. to enclose and protectthese driving partsas indicated Figs, 2 and 3. Y

the motor circuit, and timing means arranged to automaticallythrow the switch 2 3 dependent upon the position of thecrank 'l. For, this purw posea bilobed cam 24 issecured upon-the crank shaftlfi, a plunger 25 mounted in the bracket ll to. provide a followerfor-the camj24, andfthe switch 23 arranged to be actuatedby the strokes of the plunger 25 thus provided,;the switch box I being mountedon the bracket v1 1 as indicated Figs. 2 and 3.

The switch 23 is illustrated.conventionally,

only, in f Fig. .4. It is preferably of, the well actuated run-around type wherein repeated depression of a-- push button efiects alternate throw of the switch proper between" two posi tions. The switch hasthree connections as indi cated Fig. eso that in. operation it alternately "contacts a, common central connection-26 with h base for free swinging movement from the plane two other connections 27.

'-the operator, andthe two switches 23 and 28 wired with themotor'ajand the line L1, L2, as-

shown Fig. 4. The wiring arrangement and particularly that of theswitches will be recognized "time by a throw of the'switch :28; regardless of theposition of the switch 23, and maythereafter time, by a :throw of the V H to be controlled and. ashutter mountedin saidI base for freeswinging movement from-the plane.

r be stopped at any switch 23. I

be closed. and so secured. Thereafter when it is its guide pulleys in'the direction of the crank. As the crank returns to open position, if the known and commercially common push-button- 7 tween its. said connections;

v as that known as three-wire for twostation con- *trol, wherein the motor'maybe started at any Thus in the arrangement describtli,assuming 1,927,670. the crank 7 in the position indicated, if the operator atthe remote location of the switch 28. throws his switch, the motor will be started and thee-rank thus caused to move. As the crank completes a 180 throw the cam 24 willact upon the plunger 25 to throwthe switch 23 thusauto matically stopping-the motor and; consequently the crank. Bythese operations the damper will desired to release the damper, a return throw of 1 the switch 28 will restart the motor, move .the 5 crank 7i 1 tlk1e same: direction until it resumes its-"first position, whereupon the cam 24 will rethrow theswitch 23 to ,stopthe motor. It y will be emery/earner the mor 9 has'unidirec rection, however, being immaterial.

position,.the connectorS will be drawn throug damper does. not-immediately open, the slack of theeonnectorwilllie between the crank and the guide as indicated bythe bight-29', .Fig. 1 When the damper automatically opens therea after the slack will move to-the -other side of the guide pulleys and-Willlie-between the guide and the shutter. The guide being; spaced some--- what from the ,shutter there is ample clear-1.

ance for a bight in this-position, It gwill-be ob served that the connector 8 is bent about one or the other of the pulleys 14 the. position of the crank j l a l In Fig. 1 the device is shownmountedior a left-hand draft, theaxis A.;A' and the actuatin'gparts having a corresponding slope, 1 Should thebase 1 and parts-carried thereby.

dependent upon,

be mounted for right-handdraft, wherein these That the motor may be automatically stopped 0? when the crank attainsits described open and;

shut positions with referenceto its'efiect upon the jshutter; switch means-23 are arranged in.

;Wha c i o 1. In an automatic .,damperof the class de-l scribed and having an annular base adapted to be securedto thepfipeithroughwhich flow. i's'to. Y be controlled and a shutter mounted in. said base for free swinging movementfrom the-plane thereof, power, means for 5 closing said "shutteri at 7 the, will of thev operator and including 'a motor carried by saidbase! a crank member driven by said motor, a flexible connector associating said shutter with. said crankjmenibenand guide means for. said connector, effective thereon; bef

2. In an automatic damper. of 'theblasside scribed and having an annular. bafse adapted to? be secured to the p pe through which" flow is t'o be controlled'andfa shutter mounted in said;

thereof, power means for .closing'said shutter? at the ,will of the; operator. and including a' manna crank memberfdrivenby saidmotor, agfiexible connector associating 'said' shutter "with. said'.',

- crank member, guide means for said connector 7 extending .inwardly fof said. base; and thereopposite means mounting said motor outside said a base.

' ;3.. In an automatic damperof the classsdescribed and having an annularbase adapted'tof be secured to the pipe through jwhichzflow lisf thereof, power means for closing said shutter at the willl of the operator and including a crank member arranged to swing in a plane overlying said base, motor means in driving association with said crank'member, a flexible connector associating said shutter with said crank member, and guide means for said connector to be'controlled and a shutter mounted in said base for free swinging movement'from the plane thereof, power means for closing said shutter at the will. of the operator andincluding motor means arranged alongside said pipe, a crank member arranged to have its path extend over said base and said motor means, means for driving said crank member by said motor means, a flexible connector associating said shutter with said.

crank member, guide means for said connector, the parts being so proportioned and arranged that said connector may be actuated to close said shutter by a 180 throw of said crank member, driving connections for said motor and switch means associating said crank member and motor to automatically stop the motor de-' pendentupon positioning of said crank member to close or release said shutter. p 5. In an automaticjdamper scribed and having an annular base adapted to be secured to the pipe through which flow is to be controlled and a shutter mounted in said base for free swinging movement from the plane thereof, power means for closing said shutter at of the class dethe will of the operator and including a crank 7 member mounted on said base to swing between positions extending radially inwardly and outwardly respectively of the base, a flexible connector associating said crank member with said shutter for closing the latter by motionof the former, guide means for said connector extending between said shutter and the path of'fsaid' crank member, moto'r means for saidfcrank member, means mounting said motor means on said base to be positioned alongside "said pipe opposite said guide means,-anddriving means connecting said motor with said crank member.

CLARENCE HKMORRIOW. 

